Come clean means tell the truth after hiding it. This answer is correct because the expression has a fixed figurative meaning in English. In an SSC idiom question, students should match the whole phrase with its accepted meaning rather than translate each word separately.

• Classroom example: Come clean can refer to a situation involving tell the truth after hiding it.
• Story example: A writer may use Come clean when describing a situation involving tell the truth after hiding it.
• Exam example: When a sentence contains Come clean, choose the meaning “tell the truth after hiding it.”